What Is TMT BAR:
The Full form of TMT is ‘Thermo Mechanical Treatment’ through which they are produced. TMT bars are manufactured by rolling hot steel wires and then passing them through water. TMT bars have a hard outer surface and a soft core inside, which helps in making the bars corrosion resistant and also increases their weldability.
What Is HYSD Bar:
HYSD Stands for ‘High Yielding Strength Deformed’. It is a high strength construction steel that owes its superior strength ( than mild steel) to the mechanical twisting of cold bar which forms spiral ribs. However cold twisting process results into a product with high residual stress, deformation and surface defects. In this article, I will discuss
10 Reasons Why TMT Bars Are Better Than HYSD Bars:
1. TMT bars have stronger external layer when compared with HYSD due to ductile micro-structure at the core and hard crystalline exterior surface of TMT steel.
2. TMT bars have less residual stresses and more tensile strength compared to HYSD bars.
3. TMT bars do not surface flaws when compared with HYSD because they do not require twisting or torsional stress.
4. TMT bars have better corrosion resistant properties than HYSD bars due to rapid quenching and tempering in manufacturing process.
5. TMT bars can be used in various types of construction works such as concrete structures, bridges and flyovers, dams, thermal and hydel power plants, industrial structures, high-rise buildings, underground platforms in metro railway and rapid transport system.
6. TMT Bar consumes upto 17% to 20% less amount of steel than HYSD Bars.
7. TMT bars are earthquake resistant because of its high tensile strength and flexibility.
8. TMT bars are highly fire resistant they can absorb 400 to 600 degree Celsius of heat.
9. TMT bar gives longer life to the structure as they do not react with the concrete which helps to prevent rust other than HYSD Bars.
10. TMT Bar reduces the transportation cost and it is cost effective too.
FAQ
What are the advantages of TMT bars?
TMT Steel – Advantages
- Superior ductility. Outstanding malleability.
- High yield strength and toughness.
- Superb bonding strength.
- Tremendous corrosion resistance.
- Excellent earthquake resistance.
- High thermal resistance.
- Economical and safe to use.
- No loss in strength at welded joints
Why HYSD bars are preferred over mild steel bars?
Resilience to High-Stress:
HYSD bars exhibit remarkable resilience to extensive stress, outperforming mild steel bars and making them a preferred option for projects requiring strong and reliable materials
What is the difference between a TMT bar and a normal bar?
TMT steel bars are made from a specific steel alloy, primarily composed of iron with carbon content typically less than 0.30%. MS bars are predominantly made from carbon steel with a relatively low amount of carbon, usually less than 0.25%
Which is more ductile mild steel or HYSD?
Thus mild steel can be said more DUCTILE than HYSD bars. From stress-strain curve above mild steel can sustain more strain than that of HYSD bars, though HYSD have more tensile strength than mild steel
What are the benefits of TMT?
The advantages of using TMT bars in construction projects are numerous. They offer high strength and durability, better flexibility, and corrosion resistance, and they are easier to weld and bend than other reinforcement bars
What are the disadvantages of TMT?
What are the disadvantages of TMT bars. High cost and weight: TMT bars are heavy and take time for transportation. Also, it is expensive and increases the overall construction cost. Rust: Steel exposed to air and moist weather can lead to the formation of rust and it can reduce the cost of a bar
Which is better, TMT or HYSD?
TMT bars have less residual stresses and higher tensile strength than HYSD bars because TMT bars do not undergo any physical deformation, unlike HYSD bars. As TMT bars do not undergo any physical deformation (twisting), no torsional stress occurs which removes the chances of surface defects in TMT bars
What is the strength of HYSD bar?
HYSD bars are moderately resistant to corrosion and the manufacturing process itself causes surface flaws in it. It is heavily weighted, and its transportation cost is high. Residual stress is high and tensile stress is low in HYSD bars that cause deformation. The yield strength of HYSD bars is 415 MPa
